Engineering Board Exam Reviewer · Matrix Inverse and Cofactors · medium

Find the inverse of A= bmatrix2&1\5&3 bmatrix.

1. bmatrix3&-1\-5&2 bmatrix
2. bmatrix3&1\5&2 bmatrix
3. bmatrix2&-1\-5&3 bmatrix
4. bmatrix-3&1\5&-2 bmatrix

Answer

A. bmatrix3&-1\-5&2 bmatrix

Solution

(A)=2(3)-1(5)=1. A-1=1/1 bmatrix3&-1\-5&2 bmatrix= bmatrix3&-1\-5&2 bmatrix.

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